<template>
  <div class="search-container">搜索页面
    <form action="/">
      <van-search
         v-model="searchText"
         show-action
         placeholder="请输入搜索关键词"
         background="#3296fa"
         @search="onSearch"
         @cancel="onCancel"
         @focus="isResultShow = false"
      />
    </form>
    <!-- 搜索结果 -->
    <search-result
      v-if="isResultShow"
      :search-text="searchText" 
    />
    <!-- 联想建议 -->
    <search-suggestion 
      @search="onSearch" 
      v-else-if="searchText" 
      :search-text="searchText" 
    />
    <!-- 搜索历史记录 -->
    <search-history 
      v-else 
      :search-histories="searchHistories" 
      @clear-search-histories="searchHistories = []"
      @search="onSearch"
    />
  </div>
</template>

<script>
import searchHistory from './components/search-history.vue'
import searchSuggestion from './components/search-suggestion.vue'
import searchResult from './components/search-result.vue'
import { setItem,getItem } from '@/utils/storage'
export default {
  name: 'SearchIndex',
  components: {
      searchHistory,
      searchSuggestion,
      searchResult
  },
  data() {
    return {
      searchText: '',
      isResultShow: false ,// 控制搜索结果的显示状态
      searchHistories: getItem('TOUTIAO_SEARCH_HISTORY') || [] // 存储历史记录
    }
  },
  methods: {
    onSearch(val) {
      // 更新文本框的内容
     this.searchText = val

     // 存储搜索历史记录
     // 不要有重复历史记录、最新的排在最前面
     const index = this.searchHistories.indexOf(val)
     if(index !== -1){
      this.searchHistories.splice(index,1)
     }
     this.searchHistories.unshift(val)
     // 渲染搜索结果
     this.isResultShow = true
    },
    onCancel() {
      this.$router.back()
    }
  },
  watch: {
    searchHistories (value) {
      // 同步搜索数据到本地
      setItem('TOUTIAO_SEARCH_HISTORY', value)
    }
  }
}
</script>

<style scoped lang="less">
.search-container {
     .van-search__action {
       color: #fff;
     }
   }
</style>